412.4.6 Fire suppression.
BC § 412.4.6
Aircraft hangars shall be provided with a fire suppression system designed in accordance with NFPA 409, based upon the classification for the hangar given in Table 412.4.6 of this code. Exception: Where a fixed base operator has separate repair facilities on site, Group II hangars operated by a fixed base operator used for storage of transient aircraft only shall have a fire suppression system, but the system is exempt from foam requirements. Table 412.4.6Hangar Fire Suppression Requirements a, b, c Maximum Single Fire Area(square feet)Type of ConstructionIAIBIIAIIBIIIAIIIBIVVA dVB dMaximum Single Fire Area(square feet)Type of ConstructionIAIBIIAIIBIIIAIIIBIVVA dVB d≥ 40,001Group IGroup IGroup IGroup IGroup IGroup IGroup IGroup IGroup I40,000Group IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup II30,000Group IIIGroup IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup II20,000Group IIIGroup IIIGroup IIGroup IIGroup IIGroup IIGroup IIGroup IIGroup II15,000Group IIIGroup IIIGroup IIIGroup IIGroup IIIGroup IIGroup IIIGroup IIGroup II12,000Group IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIGroup II8,000Group IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup II5,000Group IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIIGroup IIGroup II For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2. a. Aircraft hangars with a door height greater than 28 feet shall be provided with fire suppression for a Group I hangar regardless of maximum fire area. b. Groups shall be as classified in accordance with NFPA 409. c. Membrane structures complying with Section 3102 shall be classified as a Group IV hangar. d. Construction Types VA and VB are not permitted in Fire Districts. See Tables 504.3, 504.4 and 506.2.
